EP1500084B1 - Representation parametrique d'un signal audio spatial - Google Patents

Representation parametrique d'un signal audio spatial Download PDF

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Publication number
EP1500084B1
EP1500084B1 EP20030715237 EP03715237A EP1500084B1 EP 1500084 B1 EP1500084 B1 EP 1500084B1 EP 20030715237 EP20030715237 EP 20030715237 EP 03715237 A EP03715237 A EP 03715237A EP 1500084 B1 EP1500084 B1 EP 1500084B1
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EP
European Patent Office
Prior art keywords
signal
spatial parameters
spatial
audio signal
measure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP20030715237
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German (de)
English (en)
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EP1500084A1 (fr
Inventor
Dirk J. Breebaart
Steven L. J. D. E. Van De Par
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Koninklijke Philips NV
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Koninklijke Philips Electronics NV
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Priority to EP20070119364 priority Critical patent/EP1881486B1/fr
Priority to EP20030715237 priority patent/EP1500084B1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/008—Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/02—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
    • H04S2420/03—Application of parametric coding in stereophonic audio systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic
    • H04S3/008—Systems employing more than two channels, e.g. quadraphonic in which the audio signals are in digital form, i.e. employing more than two discrete digital channels

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Acoustics & Sound (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Health & Medical Sciences (AREA)
  • Computational Linguistics (AREA)
  • Human Computer Interaction (AREA)
  • Multimedia (AREA)
  • Mathematical Physics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Stereophonic System (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Stereo-Broadcasting Methods (AREA)

Claims (14)

  1. Procédé de codage d'un signal audio, le procédé comprenant:
    - la génération (S8) d'un signal monophonique comprenant une combinaison d'au moins deux canaux audios d'entrée (L,R),
    - la détermination (S2, S3, S4) d'un ensemble de paramètres spatiaux (ILD, ITD, C) indicatif de propriétés spatiales des au moins deux canaux audios d'entrée, l'ensemble de paramètres spatiaux comprenant un paramètre (C) représentant une mesure de la ressemblance de formes d'onde des au moins deux canaux audios d'entrée,
    - la génération (S5, S6, S7, S9) d'un signal codé comprenant le signal monophonique et l'ensemble de paramètres spatiaux
    caractérisé en ce que
    la mesure de ressemblance correspond à une valeur d'une fonction d'intercorrélation lors d'un maximum de ladite fonction d'intercorrélation.
  2. Procédé selon la revendication 1, dans lequel l'étape de détermination d'un ensemble de paramètres spatiaux indicatif de propriétés spatiales comprend la détermination d'un ensemble de paramètres spatiaux comme une fonction du temps et de la fréquence.
  3. Procédé selon la revendication 2, dans lequel l'étape de détermination d'un ensemble de paramètres spatiaux indicatif de propriétés spatiales comprend
    - la division de chacun des au moins deux canaux audios d'entrée en pluralités correspondantes de bandes de fréquences;
    - pour chaque bande de la pluralité de bandes de fréquences, la détermination de l'ensemble de paramètres spatiaux indicatif de propriétés spatiales des au moins deux canaux audios d'entrée à l'intérieur de la bande de fréquences correspondante.
  4. Procédé selon l'une quelconque des revendications 1 à 3, dans lequel l'ensemble de paramètres spatiaux comprend au moins un repère de localisation.
  5. Procédé selon la revendication 4, dans lequel l'ensemble de paramètres spatiaux comprend au moins deux repères de localisation incluant une différence de niveau entre canaux et, au choix, une différence temporelle entre canaux ou une différence de phase entre canaux.
  6. Procédé selon la revendication 4 ou 5, dans lequel la mesure de ressemblance comprend des informations dont ne peuvent pas rendre compte les repères de localisation.
  7. Procédé selon l'une quelconque des revendications 1 à 6, dans lequel l'étape de génération d'un signal codé incluant le signal monophonique et l'ensemble de paramètres spatiaux comprend la génération d'un ensemble de paramètres spatiaux quantifiés, chacun introduisant une erreur de quantification correspondante par rapport au paramètre spatial déterminé correspondant, où au moins une des erreurs de quantification introduites est commandée pour dépendre d'une valeur d'au moins un des paramètres spatiaux déterminés.
  8. Codeur pour coder un signal audio, le codeur comprenant:
    - des moyens pour générer un signal monophonique comprenant une combinaison d'au moins deux canaux audios d'entrée,
    - des moyens pour déterminer un ensemble de paramètres spatiaux indicatif de propriétés spatiales des au moins deux canaux audios d'entrée, l'ensemble de paramètres spatiaux comprenant un paramètre représentant une mesure de la ressemblance de formes d'onde des au moins deux canaux audios d'entrée, et
    - des moyens pour générer un signal codé comprenant le signal monophonique et l'ensemble de paramètres spatiaux, caractérisé en ce que
    la mesure de ressemblance correspond à une valeur d'une fonction d'intercorrélation lors d'un maximum de ladite fonction d'intercorrélation.
  9. Appareil destiné à fournir un signal audio, l'appareil comprenant:
    une entrée pour recevoir un signal audio,
    un codeur selon la revendication 8 pour coder le signal audio, afin d'obtenir un signal audio codé, et
    une sortie pour fournir le signal audio codé.
  10. Signal audio codé, le signal comprenant:
    un signal monophonique comprenant une combinaison d'au moins deux canaux audios, et
    un ensemble de paramètres spatiaux indicatif de propriétés spatiales des au moins deux canaux audios d'entrée, l'ensemble de paramètres spatiaux comprenant un paramètre représentant une mesure de la ressemblance de formes d'onde des au moins deux canaux audios d'entrée, caractérisé en ce que
    la mesure de ressemblance correspond à une valeur d'une fonction d'intercorrélation lors d'un maximum de ladite fonction d'intercorrélation.
  11. Support de mémoire sur lequel est mémorisé un signal codé selon la revendication 10.
  12. Procédé de décodage d'un signal audio codé, le procédé comprenant:
    l'obtention (210) d'un signal monophonique (S) à partir du signal audio codé (203), le signal monophonique comprenant une combinaison d'au moins deux canaux audios (L,R),
    l'obtention (210) d'un ensemble de paramètres spatiaux (P) à partir du signal audio codé, et
    la génération (211) d'un signal de sortie multicanal à partir du signal monophonique et des paramètres spatiaux, l'ensemble de paramètres spatiaux comprenant un paramètre représentant une mesure de la ressemblance de formes d'onde du signal de sortie multicanal, caractérisé en ce que
    la mesure de ressemblance correspond à une valeur d'une fonction d'intercorrélation lors d'un maximum de ladite fonction d'intercorrélation du signal de sortie multicanal.
  13. Décodeur (202) pour décoder un signal audio codé, le décodeur comprenant
    des moyens (210) pour obtenir un signal monophonique à partir du signal audio codé, le signal monophonique (S) comprenant une combinaison d'au moins deux canaux audios (L, R), et
    des moyens (210) pour obtenir un ensemble de paramètres spatiaux (P) à partir du signal audio codé, et
    des moyens pour générer (211) un signal de sortie multicanal à partir du signal monophonique et des paramètres spatiaux, l'ensemble de paramètres spatiaux comprenant un paramètre représentant une mesure de la ressemblance de formes d'onde du signal de sortie multicanal, caractérisé en ce que
    la mesure de ressemblance correspond à une valeur d'une fonction d'intercorrélation lors d'un maximum de ladite fonction d'intercorrélation du signal de sortie multicanal.
  14. Appareil pour fournir un signal audio décodé, l'appareil comprenant:
    une entrée pour recevoir un signal audio codé,
    un décodeur selon la revendication 13 pour décoder le signal audio codé, afin d'obtenir un signal de sortie multicanal, et
    une sortie pour fournir ou pour reproduire le signal de sortie multicanal.
EP20030715237 2002-04-22 2003-04-22 Representation parametrique d'un signal audio spatial Expired - Lifetime EP1500084B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20070119364 EP1881486B1 (fr) 2002-04-22 2003-04-22 Dispositif de décodage avec unité de décorrelation
EP20030715237 EP1500084B1 (fr) 2002-04-22 2003-04-22 Representation parametrique d'un signal audio spatial

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
EP02076588 2002-04-22
EP02076588 2002-04-22
EP02077863 2002-07-12
EP02077863 2002-07-12
EP02079303 2002-10-14
EP02079303 2002-10-14
EP02079817 2002-11-20
EP02079817 2002-11-20
PCT/IB2003/001650 WO2003090208A1 (fr) 2002-04-22 2003-04-22 Representation parametrique d'un signal audio spatial
EP20030715237 EP1500084B1 (fr) 2002-04-22 2003-04-22 Representation parametrique d'un signal audio spatial

Related Child Applications (1)

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EP20070119364 Division EP1881486B1 (fr) 2002-04-22 2003-04-22 Dispositif de décodage avec unité de décorrelation

Publications (2)

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EP1500084A1 EP1500084A1 (fr) 2005-01-26
EP1500084B1 true EP1500084B1 (fr) 2008-01-23

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EP20030715237 Expired - Lifetime EP1500084B1 (fr) 2002-04-22 2003-04-22 Representation parametrique d'un signal audio spatial
EP20070119364 Expired - Lifetime EP1881486B1 (fr) 2002-04-22 2003-04-22 Dispositif de décodage avec unité de décorrelation

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US (3) US8340302B2 (fr)
EP (2) EP1500084B1 (fr)
JP (3) JP4714416B2 (fr)
KR (2) KR100978018B1 (fr)
CN (1) CN1307612C (fr)
AT (2) ATE426235T1 (fr)
AU (1) AU2003219426A1 (fr)
BR (2) BRPI0304540B1 (fr)
DE (2) DE60326782D1 (fr)
ES (2) ES2300567T3 (fr)
WO (1) WO2003090208A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7751572B2 (en) 2005-04-15 2010-07-06 Dolby International Ab Adaptive residual audio coding
US10163449B2 (en) 2013-04-05 2018-12-25 Dolby International Ab Stereo audio encoder and decoder

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